Muscle's
Shoulder girdle
Trapezius
Back of the skull
Insertion
Spine of scapula and lateral edge of clavicle
Joint Actions
Upper fibres elevate the shoulder girdle
Middle fibres retract shoulder girdle
Lower fibres depress shoulder girdle
Rhomboids
Spinous process of cervical and thoracic vertebrae
Insertion
Medial border of scapula
Joint actions
Retracts scapula
Downwardly rotates scapula
Levator Scapulae
Transverse processes of cervical vertebrae
Insertion
Medial border of scapula, between superior angle and root of the spine
Joint action
Origin fixed: Elevates the scapular. Assists in downwards rotation of scapula
Insertion fixed: Laterally flexes the next
Serratus Anterior
Front of ribs 1-8
Insertion
Anterior surface of medial border of scapula
Joint Action
Protracts the scapula
Upwardly rotates scapula
Pectoralis Minor
Front of ribs
Insertion
Coracoid process of scapula
Joint action
Origin fixed: Protracts the scapula. Downwardly rotates scapula.
Insertion fixed: Elevates ribs during breathing